docs: def parse_options():
  	"""
  	parse_options() -> opts, args
  
  	Parse any command-line options given returning both
  	the parsed options and arguments.
  	"""
  
  	parser = optparse.OptionParser(usage=USAGE, version=VERSION)
  
  	parser.add_option("-o", "--ontology",
  			action="store", type="string", default="", dest="ontology",
  			help="Specifies which ontology to compare to.")
  
  	opts, args = parser.parse_args()
  
  	if len(args) < 1 or not opts.ontology:
  		parser.print_help()
  		raise SystemExit(1)
  
  	return opts, args